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Linux/security/apparmor/audit.c

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  1 /*
  2  * AppArmor security module
  3  *
  4  * This file contains AppArmor auditing functions
  5  *
  6  * Copyright (C) 1998-2008 Novell/SUSE
  7  * Copyright 2009-2010 Canonical Ltd.
  8  *
  9  * This program is free software; you can redistribute it and/or
 10  * modify it under the terms of the GNU General Public License as
 11  * published by the Free Software Foundation, version 2 of the
 12  * License.
 13  */
 14 
 15 #include <linux/audit.h>
 16 #include <linux/socket.h>
 17 
 18 #include "include/apparmor.h"
 19 #include "include/audit.h"
 20 #include "include/policy.h"
 21 
 22 const char *const op_table[] = {
 23         "null",
 24 
 25         "sysctl",
 26         "capable",
 27 
 28         "unlink",
 29         "mkdir",
 30         "rmdir",
 31         "mknod",
 32         "truncate",
 33         "link",
 34         "symlink",
 35         "rename_src",
 36         "rename_dest",
 37         "chmod",
 38         "chown",
 39         "getattr",
 40         "open",
 41 
 42         "file_perm",
 43         "file_lock",
 44         "file_mmap",
 45         "file_mprotect",
 46 
 47         "create",
 48         "post_create",
 49         "bind",
 50         "connect",
 51         "listen",
 52         "accept",
 53         "sendmsg",
 54         "recvmsg",
 55         "getsockname",
 56         "getpeername",
 57         "getsockopt",
 58         "setsockopt",
 59         "socket_shutdown",
 60 
 61         "ptrace",
 62 
 63         "exec",
 64         "change_hat",
 65         "change_profile",
 66         "change_onexec",
 67 
 68         "setprocattr",
 69         "setrlimit",
 70 
 71         "profile_replace",
 72         "profile_load",
 73         "profile_remove"
 74 };
 75 
 76 const char *const audit_mode_names[] = {
 77         "normal",
 78         "quiet_denied",
 79         "quiet",
 80         "noquiet",
 81         "all"
 82 };
 83 
 84 static const char *const aa_audit_type[] = {
 85         "AUDIT",
 86         "ALLOWED",
 87         "DENIED",
 88         "HINT",
 89         "STATUS",
 90         "ERROR",
 91         "KILLED"
 92         "AUTO"
 93 };
 94 
 95 /*
 96  * Currently AppArmor auditing is fed straight into the audit framework.
 97  *
 98  * TODO:
 99  * netlink interface for complain mode
100  * user auditing, - send user auditing to netlink interface
101  * system control of whether user audit messages go to system log
102  */
103 
104 /**
105  * audit_base - core AppArmor function.
106  * @ab: audit buffer to fill (NOT NULL)
107  * @ca: audit structure containing data to audit (NOT NULL)
108  *
109  * Record common AppArmor audit data from @sa
110  */
111 static void audit_pre(struct audit_buffer *ab, void *ca)
112 {
113         struct common_audit_data *sa = ca;
114         struct task_struct *tsk = sa->aad->tsk ? sa->aad->tsk : current;
115 
116         if (aa_g_audit_header) {
117                 audit_log_format(ab, "apparmor=");
118                 audit_log_string(ab, aa_audit_type[sa->aad->type]);
119         }
120 
121         if (sa->aad->op) {
122                 audit_log_format(ab, " operation=");
123                 audit_log_string(ab, op_table[sa->aad->op]);
124         }
125 
126         if (sa->aad->info) {
127                 audit_log_format(ab, " info=");
128                 audit_log_string(ab, sa->aad->info);
129                 if (sa->aad->error)
130                         audit_log_format(ab, " error=%d", sa->aad->error);
131         }
132 
133         if (sa->aad->profile) {
134                 struct aa_profile *profile = sa->aad->profile;
135                 pid_t pid;
136                 rcu_read_lock();
137                 pid = rcu_dereference(tsk->real_parent)->pid;
138                 rcu_read_unlock();
139                 audit_log_format(ab, " parent=%d", pid);
140                 if (profile->ns != root_ns) {
141                         audit_log_format(ab, " namespace=");
142                         audit_log_untrustedstring(ab, profile->ns->base.hname);
143                 }
144                 audit_log_format(ab, " profile=");
145                 audit_log_untrustedstring(ab, profile->base.hname);
146         }
147 
148         if (sa->aad->name) {
149                 audit_log_format(ab, " name=");
150                 audit_log_untrustedstring(ab, sa->aad->name);
151         }
152 
153         if (sa->aad->tsk) {
154                 audit_log_format(ab, " pid=%d comm=", tsk->pid);
155                 audit_log_untrustedstring(ab, tsk->comm);
156         }
157 
158 }
159 
160 /**
161  * aa_audit_msg - Log a message to the audit subsystem
162  * @sa: audit event structure (NOT NULL)
163  * @cb: optional callback fn for type specific fields (MAYBE NULL)
164  */
165 void aa_audit_msg(int type, struct common_audit_data *sa,
166                   void (*cb) (struct audit_buffer *, void *))
167 {
168         sa->aad->type = type;
169         common_lsm_audit(sa, audit_pre, cb);
170 }
171 
172 /**
173  * aa_audit - Log a profile based audit event to the audit subsystem
174  * @type: audit type for the message
175  * @profile: profile to check against (NOT NULL)
176  * @gfp: allocation flags to use
177  * @sa: audit event (NOT NULL)
178  * @cb: optional callback fn for type specific fields (MAYBE NULL)
179  *
180  * Handle default message switching based off of audit mode flags
181  *
182  * Returns: error on failure
183  */
184 int aa_audit(int type, struct aa_profile *profile, gfp_t gfp,
185              struct common_audit_data *sa,
186              void (*cb) (struct audit_buffer *, void *))
187 {
188         BUG_ON(!profile);
189 
190         if (type == AUDIT_APPARMOR_AUTO) {
191                 if (likely(!sa->aad->error)) {
192                         if (AUDIT_MODE(profile) != AUDIT_ALL)
193                                 return 0;
194                         type = AUDIT_APPARMOR_AUDIT;
195                 } else if (COMPLAIN_MODE(profile))
196                         type = AUDIT_APPARMOR_ALLOWED;
197                 else
198                         type = AUDIT_APPARMOR_DENIED;
199         }
200         if (AUDIT_MODE(profile) == AUDIT_QUIET ||
201             (type == AUDIT_APPARMOR_DENIED &&
202              AUDIT_MODE(profile) == AUDIT_QUIET))
203                 return sa->aad->error;
204 
205         if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
206                 type = AUDIT_APPARMOR_KILL;
207 
208         if (!unconfined(profile))
209                 sa->aad->profile = profile;
210 
211         aa_audit_msg(type, sa, cb);
212 
213         if (sa->aad->type == AUDIT_APPARMOR_KILL)
214                 (void)send_sig_info(SIGKILL, NULL,
215                                     sa->aad->tsk ?  sa->aad->tsk : current);
216 
217         if (sa->aad->type == AUDIT_APPARMOR_ALLOWED)
218                 return complain_error(sa->aad->error);
219 
220         return sa->aad->error;
221 }
222 

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